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1.
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DB2uDB具有自动备份数据库和整理数据库碎片的能力。
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2.
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本文在一定的假设条件下，建立了适用于竖管降膜传热蒸发传热传质耦合的物理数学模型。
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3.
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负数的发现、无理数的发现等这样的例子在数学史上不胜枚举。
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4.
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利用有理数对实数逼近的表示方式，给出黎曼函数处处不可导的一种证明，给出单位圆周上的有理点在单位圆上稠密的证明。
※ "理数"造句
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怎祝网汉语词典查词提供。